题干
It is only ______ you understand what your parents do to you ______ you can improve your relationship with your parents.
A：that; what
B：when; that
C：which; where
D：how; what
答案(点此获取答案解析）
B
是定义在实数集R上的可导函数，
是其导函数，则下列说法不正确的是
